If sky wave with a frequency of 60 MHz is incident on D- region at an angle of `30^@`, then find the angle of refractive.

The sky wave with a frequency of 20 MHz is incidnet on D-region at an angle of 45^(@) , then angle of refraction is

A sky wave with a frequency 55 MHz is incident on D-region of the earth.s atmosphere at 45^(@) . The angle of refraction is (electron density for D-region is 400 electron/c.c)

A sky wave with a frequency 64.4 MHz is incident on D -region of earth's atmosphere at 45^(@) . The angle of refraction is (electron density for D -region is 400 "electron"//cm^(3) )

A sky wave with a frequency 55 MHz is incident on D-region of earth's atmosphere at 45^(@) . The angle of refraction is (electorn density for D-region is 400 "electron"//cm_(3) )

A sky wave with a frequency 55 MHz is incidenet on D-region of earth's atmosphere at 45^(@) , The angle of refraction is (electron density for D-region is 400 electron/c.c.